# Petroleum Dictionary vs Petroleum Engineering+

The clearest difference is ads: Petroleum Engineering+ at none against Petroleum Dictionary's shown. Petroleum Engineering+ also leads on update cadence (monthly vs every 9 months). Petroleum Dictionary's advantage is iOS requirement (15.6 vs 17.0). On price, rating, ratings volume and in-app purchases there is nothing between them.

Both are free to download. Petroleum Dictionary sells 5 in-app purchases, starting at $1.99 per 7 days and Petroleum Engineering+ sells 6 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.4 for Petroleum Dictionary against 4.5 for Petroleum Engineering+. Both are backed by a comparable volume of ratings — 9 and 4 respectively.

Petroleum Dictionary ships an update every 9 months, Petroleum Engineering+ monthly. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Petroleum Dictionary | Petroleum Engineering+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (9 ratings)](https://appshunter.io/ios/app/petroleum-dictionary-offline/id1487805808/reviews) | **[4.5 (4 ratings)](https://appshunter.io/ios/app/petroleum-engineering-plus/id6746214573/reviews)** |
| Number of ratings | **9** | 4 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 9 months | **Monthly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 13 MB | 18 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Puju Dekivadiya](https://appshunter.io/developer/1289574712) | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) |

## What reviewers say

### Petroleum Dictionary

[App page](https://appshunter.io/ios/app/petroleum-dictionary-offline/id1487805808)

This app provides a comprehensive offline dictionary for petroleum engineering terms, including definitions, equations, formulas, and quizzes. It offers features like speech-to-text, text-to-speech, and the ability to save favorites and view search history. It's designed for students and professionals in the oil and gas industry.

**Highlights:** Offline access to over 5000 petroleum terms, Includes engineering equations and formulas, Interactive quizzes to test knowledge, Speech-to-text and text-to-speech functionality, Save favorite terms and view search history, Easy-to-use interface

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Pro Plan | $1.99 | per 7 days |
| Monthly Pro Plan | $4.99 | per month |
| Yearly Pro Plan | $29.99 | per year |
| Remove Ads | $9.99 | one-time |
| Lifetime Access | $39.99 | one-time |


### Petroleum Engineering+

[App page](https://appshunter.io/ios/app/petroleum-engineering-plus/id6746214573)

Master petroleum engineering concepts through engaging quizzes covering a wide range of topics from geology to production. Ideal for students and professionals seeking to enhance their knowledge and skills in the oil and gas industry.

**Highlights:** Comprehensive quiz coverage, Topics from geology to production, Boost knowledge and skills, Engaging learning experience, Suitable for students and professionals

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month | $9.99 | per month |
| 6 Months | $19.99 | per 6 months |
| 1 Year | $29.99 | per year |
| 1500 | $0.99 | one-time |
| 3500 | $1.99 | one-time |
| 9000 | $3.99 | one-time |


## Frequently asked questions

### Is Petroleum Dictionary free?

Petroleum Dictionary is free to download, with in-app purchases available.

### Is Petroleum Engineering+ free?

Petroleum Engineering+ is free to download, with in-app purchases available.

### Which has better reviews, Petroleum Dictionary or Petroleum Engineering+?

Petroleum Engineering+ is rated higher. Petroleum Dictionary averages 4.4 out of 5 from 9 ratings, while Petroleum Engineering+ averages 4.5 from 4 ratings.

### Do Petroleum Dictionary or Petroleum Engineering+ have ads?

Petroleum Dictionary shows ads; Petroleum Engineering+ does not.

### Which is updated more often, Petroleum Dictionary or Petroleum Engineering+?

Petroleum Dictionary ships an update every 9 months, and Petroleum Engineering+ monthly. Most recently, Petroleum Dictionary was updated on October 26, 2026 and Petroleum Engineering+ on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*